What you have in the exchanges are IOUs assets that were purchased during QTUM ICO, but now traded in the exchanges. These assets will be formally converted to QTUM tokens on mainnet, i.e. when production (real) version of the QTUM wallet is launched.
The sparknet tokens are just for testing purposes, to help get you comfortable with the QTUM ecosystem - how to create wallets, send tokens, receive tokens, encrypt wallet, stake asset, etc. The test tokens have no fiduciary employment.

@dili well then whats skynet? I though skynet is for testing purpose. Also on skynet 1.2 release it clearly says to get rid of everything related to sparknet. My question is little deeper which is if skynet is live testnet now then when I run qtum on info panel why it says "Main" for network also if I ran it with -testnet flag then would it still work on skynet ?

If its all for testing then whats the use of the "reward" that its staking..are they gonna be transferable later?